One full year of solar motion above the Parthenon (447-438 BC) at the World Heritage Site of the Acropolis in Athens, Greece. The very difficult task of capturing this year-long phenomenon in a single frame has been achieved only some 20 times. An analemma is the figure "8" loop that results when one observes the position of the sun at the same time of day over the course of a year. The 23.5° tilt of the earth's axis of rotation and its elliptical orbit about the sun result in the apparent change in the sun's location in the sky when observed at the same location at the same time of day over a year's time. This photo is the first analemma ever imaged perfectly vertically on the southern meridian. Anthony Ayiomamitis/Perseus.gr.